why did you not buy 100 ladybugs and release them in to your grow room, they would eat the whitefly and spiders non stop like flies round a shit, they are cheap to buy, you can then refridgerate them afterwards to put them in to a suspended animation for another day or just leave them in the grow room permanently, you can also buy a special smoke bomb that you light in the grow room and the smoke kills the pests without harming your plants but they are very expensive, the cheaper smoke bomb you can buy to smoke the insects will kill the plants too. but to buy this poison and spray it on to something you are gonna smoke you will probably put yourself in to an early grave with a brain cancer or something that will puzzle the doctors down at the hospital when you get there in later life. they will call it the burger boss disease, (you know what i mean) dont put chemicals on your plants. do that only if the ass hole down the road is buying them from you!!!!